JP4321351B2 - Tire condition monitoring system - Google Patents

Tire condition monitoring system Download PDF

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JP4321351B2
JP4321351B2 JP2004146094A JP2004146094A JP4321351B2 JP 4321351 B2 JP4321351 B2 JP 4321351B2 JP 2004146094 A JP2004146094 A JP 2004146094A JP 2004146094 A JP2004146094 A JP 2004146094A JP 4321351 B2 JP4321351 B2 JP 4321351B2
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tire
vehicle
transceivers
transceiver
communication
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JP2005324724A (en
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明広 田口
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Denso Corp
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Denso Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Measuring Fluid Pressure (AREA)

Description

本発明は、タイヤ空気圧等のタイヤ状態を監視するタイヤ状態監視システムに関する。   The present invention relates to a tire condition monitoring system that monitors tire conditions such as tire pressure.

従来より、各タイヤのホイールに設けられた空気圧センサおよび送受信機と、車両側のホイールハウス等に設けられた車両側送受信機とを備えるタイヤ状態監視システムが知られている。   2. Description of the Related Art Conventionally, a tire condition monitoring system including an air pressure sensor and a transmitter / receiver provided on a wheel of each tire and a vehicle-side transmitter / receiver provided in a vehicle-side wheel house or the like is known.

このようなタイヤ状態監視システムは、現在、タイヤ情報をタイヤ状態センサで定期的にセンシングし、圧力変動や時間等といった所定条件の成立により、センシング情報をタイヤ側から車両側に送信する単方向通信を行うタイヤ状態監視システムが主流となっている。また、よりリアルタイムにタイヤ情報を得るために車両側に送信機を設け、車両側からのトリガ信号を送信することで、タイヤ側装置からセンシング情報を送信する双方向通信を行うタイヤ状態監視システムも開発されている。   Such a tire condition monitoring system currently senses tire information periodically with a tire condition sensor, and transmits sensing information from the tire side to the vehicle side when a predetermined condition such as pressure fluctuation or time is established. The tire condition monitoring system which performs is becoming mainstream. There is also a tire condition monitoring system that provides a transmitter on the vehicle side in order to obtain tire information in more real-time and performs bidirectional communication to transmit sensing information from the tire side device by transmitting a trigger signal from the vehicle side. Has been developed.

しかしながら、双方向通信を行うタイヤ状態監視システムでは、電波法や消費電力の問題から通信可能範囲が限られているため、タイヤ全周に渡る通信は困難である。この結果、タイヤが回転し、タイヤ側送受信機が車両側送受信機の通信可能範囲に入ったときにのみ通信が成立するため、車両側送受信機におけるタイヤ側送受信機から送信される信号の受信率が低くなるという問題がある。また、車両側から受信する電力信号により電力を得るタイヤ側送受信機では、特定車速以上となった場合、タイヤ１回転の時間が短くなるため、通信時間の方が長くなって、通信が成立しない状況となる。   However, in a tire condition monitoring system that performs two-way communication, communication over the entire circumference of the tire is difficult because the communicable range is limited due to radio wave law and power consumption problems. As a result, since the communication is established only when the tire rotates and the tire-side transceiver enters the communicable range of the vehicle-side transceiver, the reception rate of the signal transmitted from the tire-side transceiver in the vehicle-side transceiver There is a problem that becomes low. Further, in a tire side transceiver that obtains electric power from a power signal received from the vehicle side, when the vehicle speed exceeds a specific vehicle speed, the time for one rotation of the tire is shortened, so the communication time becomes longer and communication is not established. Situation.

本発明は上記点に鑑み、双方向通信を行うタイヤ状態監視装置において、車両側送受信機におけるタイヤ側送受信機から送信される信号の受信率を向上させることを目的とする。さらに、高速走行時でも通信可能にすることを他の目的とする。   In view of the above points, an object of the present invention is to improve the reception rate of a signal transmitted from a tire-side transceiver in a vehicle-side transceiver in a tire condition monitoring device that performs bidirectional communication. Furthermore, another object is to enable communication even when traveling at high speed.

上記目的を達成するため、請求項１に記載の発明では、車両側におけるタイヤ（１〜４）に対応する部位に配置された車両側送受信手段（２１〜２４）と、タイヤ（１〜４）に配置され、タイヤ（１〜４）の状態を検出してタイヤ状態の検出結果を含むタイヤ状態情報を電波によって車両側送受信手段（２１〜２４）に送信するタイヤ側送受信手段（１１〜１４）と、車両側送受信手段（２１〜２４）による通信を制御する車両側制御手段（３０）とを備え、タイヤ側送受信機（１１〜１４）は、車両側制御手段（３０）から車両側送受信機（２１〜２４）を介して送信される要求信号に対して、タイヤ状態情報を車両側送受信機（２１〜２４）に送信するように構成されており、タイヤ側送受信機（１１〜１４）は、要求信号を受信してから次に要求信号を受信するまでの間隔である通信成立間隔を取得するとともに、通信成立間隔に基づいて、タイヤ状態情報を車両側送受信機（２１〜２４）に送信し、タイヤ側送受信機（１１〜１４）は、車両側送受信機（２１〜２４）から受信した要求信号を含む電磁波のエネルギーを電気エネルギーに変換して電力を得るように構成されているとともに、電力が所定値を超えるまで、要求信号を１回または複数回受信した後、通信成立間隔に基づいて車両側送受信機（２１〜２４）にタイヤ状態情報を送信することを特徴としている。 In order to achieve the above object, in the invention according to claim 1, the vehicle-side transmitting / receiving means (21 to 24) disposed in a portion corresponding to the tire (1 to 4) on the vehicle side, and the tire (1 to 4) The tire side transmission / reception means (11-14) which detects the state of the tire (1-4) and transmits tire state information including the detection result of the tire condition to the vehicle side transmission / reception means (21-24) by radio waves. And vehicle side control means (30) for controlling communication by the vehicle side transmission / reception means (21-24), and the tire side transceivers (11-14) are connected to the vehicle side transmission / reception equipment from the vehicle side control means (30). In response to the request signal transmitted via (21-24), the tire state information is transmitted to the vehicle-side transceivers (21-24), and the tire-side transceivers (11-14) Received a request signal With then acquires the communication establishment interval is the interval to the reception of the request signal, based on the communication established intervals, transmit the tire condition information to the vehicle-side transceiver (21-24), the tire side transceiver (11 -14) is configured to obtain electric power by converting the energy of the electromagnetic wave including the request signal received from the vehicle-side transceiver (21-24) into electric energy, and until the electric power exceeds a predetermined value, After receiving the request signal once or a plurality of times, the tire condition information is transmitted to the vehicle-side transceivers (21 to 24) based on the communication establishment interval .

このように、タイヤ側送受信手段（１１〜１４）が車両側送受信手段（２１〜２４）との通信成立間隔を測定することで、通信可能範囲に入るタイミングを把握することができる。これにより、タイヤ側送受信手段（１１〜１４）は車両側送受信手段（２１〜２４）の通信可能範囲に存在するときのみに車両側送受信手段（２１〜２４）に信号を送信することができるので、車両側送受信手段（２１〜２４）におけるタイヤ側送受信手段（１１〜１４）から送信される信号の受信率を向上させることができる。   Thus, the tire side transmission / reception means (11-14) can grasp | ascertain the timing which enters into a communicable range by measuring the communication establishment interval with the vehicle side transmission / reception means (21-24). Thereby, since the tire side transmission / reception means (11-14) can transmit a signal to the vehicle side transmission / reception means (21-24) only when it exists in the communicable range of the vehicle side transmission / reception means (21-24). The reception rate of signals transmitted from the tire-side transmitting / receiving means (11-14) in the vehicle-side transmitting / receiving means (21-24) can be improved.

また、タイヤ側送受信機（１１〜１４）は、車両側送受信機（２１〜２４）から受信した要求信号を含む電磁波のエネルギーを電気エネルギーに変換して電力を得るように構成されているとともに、電力が所定値を超えるまで、要求信号を１回または複数回受信した後、通信成立間隔に基づいて車両側送受信機（２１〜２４）にタイヤ状態情報を送信することで、電力チャージを含む通信時間が短くなる高速走行時においても通信を成立させることができる。
 Further, the tire side transceiver (11 to 14), together are configured to obtain power by converting electromagnetic energy, including a request signal received from the vehicle transceiver (21-24) into electrical energy, until power exceeds a predetermined value, after receiving one or more times a request signal, by transmitting tire condition information to the vehicle-side transceiver (21-24) based on the communication established intervals, communication including power charge Communication can be established even during high-speed traveling where the time is shortened.

なお、上記各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものである。   In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

以下、本発明の一実施形態について図１〜図５に基づいて説明する。   Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

図１は、本実施形態におけるタイヤ状態監視装置を示す車両の平面模式図である。図１に示すように、本実施形態のタイヤ状態監視装置は、タイヤ側送受信機１１〜１４と、車両側送受信機２１〜２４と、制御ユニット３０とを備えている。タイヤ側送受信機１１〜１４と車両側送受信機２１〜２４との間は、電波による双方向の通信が行われる。   FIG. 1 is a schematic plan view of a vehicle showing a tire condition monitoring device in the present embodiment. As shown in FIG. 1, the tire condition monitoring device of the present embodiment includes tire-side transceivers 11 to 14, vehicle-side transceivers 21 to 24, and a control unit 30. Bidirectional communication using radio waves is performed between the tire-side transceivers 11-14 and the vehicle-side transceivers 21-24.

タイヤ側送受信機１１〜１４は、各走行用タイヤ１〜４に設けられており、例えば、一般的なディスクホイールのエアバルブと一体式のものを用いることができる。タイヤ側送受信機１１〜１４は、タイヤ１〜４内部の空気圧を検出するタイヤ状態検出用センサ（図示せず）を備えており、このタイヤ状態検出用センサで検出したタイヤ空気圧に関するデータを含むタイヤ状態情報を車両側送受信機２１〜２４に送信するように構成されている。タイヤ状態情報には、車両側送受信機２１〜２４のＩＤ番号も含められる。タイヤ状態検出用センサとしては、タイヤ空気圧に加えて、あるいはタイヤ空気圧に代えて、タイヤ内の温度を検出するセンサを用いることができる。   The tire side transceivers 11 to 14 are provided in the respective traveling tires 1 to 4, and for example, ones integrated with an air valve of a general disk wheel can be used. The tire-side transceivers 11 to 14 include a tire state detection sensor (not shown) that detects the air pressure inside the tires 1 to 4, and the tire includes data related to the tire pressure detected by the tire state detection sensor. It is comprised so that state information may be transmitted to the vehicle side transmitter-receivers 21-24. The tire state information includes ID numbers of the vehicle-side transceivers 21 to 24. As the tire condition detection sensor, a sensor that detects the temperature in the tire can be used in addition to the tire air pressure or instead of the tire air pressure.

なお、タイヤ状態検出用センサが本発明のタイヤ状態検出手段に相当し、タイヤ側送受信機１１〜１４が本発明のタイヤ側送受信手段に相当し、車両側送受信機２１〜２４が本発明の車両側送受信手段に相当している。   The tire condition detection sensor corresponds to the tire condition detection means of the present invention, the tire side transceivers 11 to 14 correspond to the tire side transmission / reception means of the present invention, and the vehicle side transceivers 21 to 24 correspond to the vehicle of the present invention. This corresponds to the side transmission / reception means.

ここで、タイヤ側送受信機１１〜１４の構成について図２に基づいて説明する。各タイヤ側送受信機１１〜１４は同様の構成を有しているので、ここではタイヤ側送受信機１１の構成についてのみ説明する。   Here, the structure of the tire side transmitter-receivers 11-14 is demonstrated based on FIG. Since each tire side transceiver 11-14 has the same composition, only the composition of tire side transceiver 11 is explained here.

図２は、タイヤ側送受信機１１の構成を示す説明図である。図２に示すように、タイヤ側送受信機１１は、通信制御部１１ａ、アンテナ用コンデンサ１１ｂ、アンテナ１１ｃを有して構成されている。通信制御部１１ａには、タイヤ１〜４内部の空気圧を検出するタイヤ状態検出用センサが設けられている。通信制御部１１ａは、制御ユニット３０からの要求信号を車両側送受信機（アンテナ）２１を介して受信すると、センサにより検出されるタイヤ空気圧等のタイヤ状態を含む検出信号を生成し、送信アンテナ１１ｃから電波を媒体として送信させる。なお、要求信号（電力信号）を送信する際に用いられる無線周波数と検出信号を送信する際に用いられる無線周波数とは異なっている。   FIG. 2 is an explanatory diagram showing a configuration of the tire-side transceiver 11. As shown in FIG. 2, the tire side transceiver 11 includes a communication control unit 11a, an antenna capacitor 11b, and an antenna 11c. The communication control unit 11a is provided with a tire state detection sensor for detecting the air pressure inside the tires 1 to 4. When the communication control unit 11a receives a request signal from the control unit 30 via the vehicle-side transceiver (antenna) 21, the communication control unit 11a generates a detection signal including a tire condition such as tire pressure detected by a sensor, and transmits the transmission antenna 11c. To transmit radio waves as a medium. The radio frequency used when transmitting the request signal (power signal) is different from the radio frequency used when transmitting the detection signal.

本実施形態のタイヤ側送受信機１１は、電池を内蔵せず、制御ユニット３０から車両側送受信機２１を介して受け取った電力信号（電磁波）を電気エネルギーに変換して蓄電用コンデンサ（図示せず）に蓄電し、これを電源とするように構成されている。   The tire-side transceiver 11 of the present embodiment does not incorporate a battery, converts a power signal (electromagnetic wave) received from the control unit 30 via the vehicle-side transceiver 21 into electrical energy, and stores a capacitor for storage (not shown). ), And this is used as a power source.

図１に戻り、各車両側送受信機２１〜２４は、それぞれ信号線２８で制御ユニット（ＥＣＵ）３０と接続されている。そして、各車両側送受信機２１〜２４は、各送信機１１〜１４から送信された電波を受信した場合、受信した電波に応じた電圧信号を制御ユニット３０に送信する。なお、各車両側送受信機２１〜２４のそれぞれから制御ユニット３０への信号の送信は、図１のような有線式に限らず、無線式とすることもできる。なお、制御ユニット３０が本発明の車両側制御手段に相当している。   Returning to FIG. 1, each of the vehicle-side transceivers 21 to 24 is connected to a control unit (ECU) 30 through a signal line 28. And each vehicle side transmitter-receiver 21-24 transmits the voltage signal according to the received radio wave to the control unit 30, when the radio wave transmitted from each transmitter 11-14 is received. The transmission of signals from each of the vehicle-side transceivers 21 to 24 to the control unit 30 is not limited to the wired type as shown in FIG. The control unit 30 corresponds to the vehicle side control means of the present invention.

制御ユニット３０は、一般的な構成のものであり、例えば、マイクロコンピュータやＲＯＭ、ＲＡＭ等のメモリを備えている。制御ユニット３０は、例えば、車載バッテリ（図示せず）により給電され、各車両側送受信機２１〜２４は制御ユニット３０から給電される。   The control unit 30 has a general configuration and includes, for example, a microcomputer, a memory such as a ROM, and a RAM. The control unit 30 is powered by, for example, an in-vehicle battery (not shown), and the vehicle-side transceivers 21 to 24 are powered from the control unit 30.

また、車両にはタイヤ状態表示装置４０が設けられている。タイヤ状態表示装置４０は、制御ユニット３０からの信号に基づいて運転者にタイヤ状態を報知するものであり、例えばナビゲーション装置の画面を用いて構成できる。   The vehicle is provided with a tire condition display device 40. The tire condition display device 40 notifies the driver of the tire condition based on a signal from the control unit 30, and can be configured using, for example, a screen of a navigation device.

次に、本実施形態のタイヤ側送受信機１１〜１４による車両側送受信機２１〜２４の位置特定方法について図３〜図５に基づいて説明する。各タイヤ側送受信機１１〜１４による車両側側送受信機２１〜２４の位置特定方法は同様であるので、タイヤ側送受信機１１についてのみ説明する。   Next, a method for specifying the positions of the vehicle-side transceivers 21 to 24 by the tire-side transceivers 11 to 14 according to the present embodiment will be described with reference to FIGS. Since the method for specifying the positions of the vehicle-side transceivers 21 to 24 by the tire-side transceivers 11 to 14 is the same, only the tire-side transceiver 11 will be described.

図３はタイヤ側送受信機１１と車両側送受信機２１とを示す側面図であり、図４は車両側送受信機２１の端子電圧と車両側送受信機１１の充電電圧との関係を示すタイミングチャートである。図３中の斜線部分が車両側送受信機２１の通信可能範囲を示している。   FIG. 3 is a side view showing the tire-side transceiver 11 and the vehicle-side transceiver 21, and FIG. 4 is a timing chart showing the relationship between the terminal voltage of the vehicle-side transceiver 21 and the charging voltage of the vehicle-side transceiver 11. is there. The shaded portion in FIG. 3 indicates the communicable range of the vehicle-side transceiver 21.

図３に示すように、車両側送受信機２１から要求信号を送信した際に、タイヤ側送受信機１１が通信可能範囲に位置する場合には、タイヤ側送受信機１１は車両側送受信機２１から信号を受信することができる。   As shown in FIG. 3, when the request signal is transmitted from the vehicle-side transceiver 21 and the tire-side transceiver 11 is located in the communicable range, the tire-side transceiver 11 receives a signal from the vehicle-side transceiver 21. Can be received.

図４に示すように、タイヤ側送受信機１１は車両側送受信機２１から受け取った電力信号を電力に変換する。図４に示す例では、タイヤ側送受信機１１が車両側送受信機２１から１回目の信号を受信した際には充電電圧が所定の閾値を超えていない。所定の閾値とは、タイヤ側送受信機１１が車両側送受信機２１に信号を送信するのに必要な電圧値である。タイヤ側送受信機１１は車両側送受信機２１から１回目の信号受信後、タイヤ空気圧を測定する。   As shown in FIG. 4, the tire-side transceiver 11 converts the power signal received from the vehicle-side transceiver 21 into electric power. In the example shown in FIG. 4, when the tire-side transceiver 11 receives the first signal from the vehicle-side transceiver 21, the charging voltage does not exceed a predetermined threshold value. The predetermined threshold value is a voltage value necessary for the tire-side transceiver 11 to transmit a signal to the vehicle-side transceiver 21. The tire-side transceiver 11 measures the tire air pressure after receiving the first signal from the vehicle-side transceiver 21.

タイヤ側送受信機１１は車両側送受信機２１から２回目の信号を受信した際に充電電圧が所定の閾値を超える。このとき、タイヤ側送受信機１１は車両側送受信機２１からの１回目の信号受信時と２回目の信号受信時の通信間隔を測定することで、タイヤ側送受信機１１が車両側送受信機２１の通信可能範囲に入るタイミングを把握することができる。そして、タイヤ側送受信機１１が次に車両側送受信機２１の通信可能範囲に入るタイミングで、車両側送受信機２１にタイヤ状態情報を送信する。   When the tire-side transceiver 11 receives the second signal from the vehicle-side transceiver 21, the charging voltage exceeds a predetermined threshold. At this time, the tire-side transceiver 11 measures the communication interval between the first signal reception from the vehicle-side transceiver 21 and the second signal reception so that the tire-side transceiver 11 The timing of entering the communicable range can be grasped. Then, tire state information is transmitted to the vehicle-side transceiver 21 at the timing when the tire-side transceiver 11 next enters the communicable range of the vehicle-side transceiver 21.

図５は、タイヤ側送受信機１１の通信制御部１１ａが行う車両側送受信機２１の位置特定方法を示すフローチャートである。   FIG. 5 is a flowchart illustrating a position specifying method of the vehicle-side transceiver 21 performed by the communication control unit 11a of the tire-side transceiver 11.

まず、車両側送受信機２１からの信号の受信待ちを行う（Ｓ１０）。そして、車両側送受信機２１の信号を受信できた場合には、車両側送受信機位置検出用タイマをスタートさせる（Ｓ１１）。このとき、タイヤ空気圧等のタイヤ状態を検出しておく。   First, it waits for reception of a signal from the vehicle-side transceiver 21 (S10). And when the signal of the vehicle side transmitter / receiver 21 has been received, the vehicle side transmitter / receiver position detection timer is started (S11). At this time, a tire condition such as tire pressure is detected.

再び車両側送受信機２１からの信号の受信待ちを行い（Ｓ１２）、車両側送受信機２１の信号を受信できた場合には、車両側送受信機位置検出用タイマにより前回の通信成立時から今回の通信成立時までの通信成立間隔を取得する（Ｓ１３）。   It again waits for reception of a signal from the vehicle-side transmitter / receiver 21 (S12), and when the signal from the vehicle-side transmitter / receiver 21 is received, the vehicle-side transmitter / receiver position detection timer detects the current communication from the time when the previous communication is established. The communication establishment interval until communication establishment is acquired (S13).

次に、Ｓ１３で取得した通信成立間隔に基づいて、現在のタイヤ側送受信機１１の位置が通信可能範囲であるか、かつ、タイヤ状態を検出完了しているか否かを判定する（Ｓ１４）。この結果、現在のタイヤ側送受信機１１の位置が通信可能範囲であるか、かつ、タイヤ状態を検出完了していると判定された場合には、車両側送受信機２１にタイヤ状態信号を送信する（Ｓ１５）。   Next, based on the communication establishment interval acquired in S13, it is determined whether or not the current position of the tire-side transceiver 11 is within a communicable range and the detection of the tire state has been completed (S14). As a result, if it is determined that the current position of the tire-side transceiver 11 is within the communicable range and that the tire condition has been detected, a tire condition signal is transmitted to the vehicle-side transceiver 21. (S15).

以上のように、タイヤ側送受信機１１〜１４が車両側送受信機２１〜２４との通信成立間隔を測定することで、通信可能範囲に入るタイミングを把握することができる。これにより、タイヤ側送受信機１１〜１４は車両側送受信機２１〜２４の通信可能範囲に存在するときのみに車両側送受信機２１〜２４に信号を送信することができるので、車両側送受信機２１〜２４におけるタイヤ側送受信機１１〜１４から送信される信号の受信率を向上させることができる。   As described above, the tire-side transceivers 11 to 14 measure the communication establishment interval with the vehicle-side transceivers 21 to 24, so that the timing of entering the communicable range can be grasped. Thereby, since the tire side transceivers 11-14 can transmit a signal to the vehicle side transceivers 21-24 only when it exists in the communicable range of the vehicle side transceivers 21-24, the vehicle side transceiver 21 It is possible to improve the reception rate of signals transmitted from the tire side transceivers 11 to 14 in .about.24.

また、タイヤ側送受信機１１〜１４が車両側から受信する電力信号により電力を得る構成の場合には、タイヤ側送受信機１１〜１４が得た電力が信号送信可能な所定値に上昇するまで、車両側からの信号を複数回受信するようにすることで、電力チャージを含む通信時間が短くなる高速走行時においても通信を成立させることができる。低速走行時や内蔵電池により電源供給される車両側送受信機１１〜１４の場合には、車両側送受信機２１〜２４の位置検出後、タイヤ空気圧の測定から送信まで一度に行うようにしてもよい。   Moreover, in the case of the configuration in which the tire-side transceivers 11 to 14 obtain power by the power signal received from the vehicle side, until the power obtained by the tire-side transceivers 11 to 14 rises to a predetermined value capable of signal transmission, By receiving the signal from the vehicle side a plurality of times, communication can be established even during high-speed travel where the communication time including the power charge is shortened. In the case of the vehicle-side transceivers 11 to 14 that are powered by a built-in battery during low-speed traveling, after the position of the vehicle-side transceivers 21 to 24 is detected, the tire air pressure measurement may be performed at a time. .

（他の実施形態）
なお、上記実施形態のタイヤ側送受信機１１〜１４は、車両側から受信する電力信号により電力を得る構成としたが、本発明は内部に電池を内蔵するようにし、これを電源とする構成においても適用可能である。 (Other embodiments)
In addition, although the tire side transceivers 11-14 of the said embodiment were set as the structure which acquires electric power with the electric power signal received from the vehicle side, this invention is made to incorporate a battery inside and uses this as a power supply. Is also applicable.

また、上記実施形態では、車両側送受信機２１〜２４、制御ユニット３０、タイヤ状態表示装置をそれぞれ信号線で接続したが、これらを図６の模式図に示すように車内ＬＡＮ２９を用いて接続するように構成してもよい。   Moreover, in the said embodiment, although the vehicle side transmitter-receivers 21-24, the control unit 30, and the tire condition display apparatus were each connected with the signal line, these are connected using in-vehicle LAN29 as shown in the schematic diagram of FIG. You may comprise as follows.

タイヤ状態監視装置を示す車両の平面模式図である。It is a plane schematic diagram of a vehicle showing a tire condition monitoring device. タイヤ側送受信機の構成を示す説明図である。It is explanatory drawing which shows the structure of a tire side transmitter / receiver. 車両側送受信機の通信可能範囲を示す側面図である。It is a side view which shows the communicable range of a vehicle side transmitter / receiver. 車両側送受信機の端子電圧と車両側送受信機の充電電圧との関係を示すタイミングチャートである。It is a timing chart which shows the relationship between the terminal voltage of a vehicle side transmitter / receiver, and the charging voltage of a vehicle side transmitter / receiver. 制御ユニットが行うタイヤ側送受信機の位置特定方法を示すフローチャートである。It is a flowchart which shows the position specification method of the tire side transmitter / receiver which a control unit performs. タイヤ状態監視装置の変形例を示す車両の平面模式図である。It is a plane schematic diagram of the vehicle which shows the modification of a tire condition monitoring apparatus.

符号の説明Explanation of symbols

１〜４…タイヤ、１１〜１４…タイヤ側送受信機、２１〜２４…車両側送受信機、３０…制御ユニット、４０…タイヤ状態表示装置。   DESCRIPTION OF SYMBOLS 1-4 ... Tire, 11-14 ... Tire side transmitter / receiver, 21-24 ... Vehicle side transmitter / receiver, 30 ... Control unit, 40 ... Tire condition display apparatus.

Claims (1)

車両側におけるタイヤ（１〜４）に対応する部位に配置された車両側送受信手段（２１〜２４）と、
前記タイヤ（１〜４）に配置され、前記タイヤ（１〜４）の状態を検出して前記タイヤ状態の検出結果を含むタイヤ状態情報を電波によって前記車両側送受信手段（２１〜２４）に送信するタイヤ側送受信手段（１１〜１４）と、
前記車両側送受信手段（２１〜２４）による通信を制御する車両側制御手段（３０）とを備え、
前記タイヤ側送受信機（１１〜１４）は、車両側制御手段（３０）から前記車両側送受信機（２１〜２４）を介して送信される要求信号に対して、前記タイヤ状態情報を前記車両側送受信機（２１〜２４）に送信するように構成されており、
前記タイヤ側送受信機（１１〜１４）は、前記要求信号を受信してから次に前記要求信号を受信するまでの間隔である通信成立間隔を取得するとともに、前記通信成立間隔に基づいて、前記タイヤ状態情報を前記車両側送受信機（２１〜２４）に送信し、
前記タイヤ側送受信機（１１〜１４）は、前記車両側送受信機（２１〜２４）から受信した前記要求信号を含む電磁波のエネルギーを電気エネルギーに変換して電力を得るように構成されているとともに、前記電力が所定値を超えるまで、前記要求信号を１回または複数回受信した後、前記通信成立間隔に基づいて前記車両側送受信機（２１〜２４）に前記タイヤ状態情報を送信することを特徴とするタイヤ状態監視装置。 Vehicle-side transmission / reception means (21 to 24) disposed in a portion corresponding to the tire (1 to 4) on the vehicle side;
Tire state information arranged on the tire (1-4), detecting the state of the tire (1-4) and transmitting the tire state information including the detection result of the tire state to the vehicle-side transmitting / receiving means (21-24) by radio waves Tire-side transmitting / receiving means (11-14) to perform,
Vehicle side control means (30) for controlling communication by the vehicle side transmission / reception means (21-24),
The tire side transceivers (11-14) send the tire condition information to the vehicle side in response to request signals transmitted from the vehicle side control means (30) via the vehicle side transceivers (21-24). It is configured to transmit to the transceiver (21-24),
The tire-side transceiver (11-14) acquires a communication establishment interval that is an interval from receiving the request signal to receiving the request signal next, and based on the communication establishment interval, Transmit tire condition information to the vehicle-side transceiver (21-24) ,
The tire-side transceivers (11-14) are configured to obtain electric power by converting energy of electromagnetic waves including the request signals received from the vehicle-side transceivers (21-24) into electrical energy. The tire condition information is transmitted to the vehicle-side transceivers (21 to 24) based on the communication establishment interval after receiving the request signal once or a plurality of times until the electric power exceeds a predetermined value. A tire condition monitoring device.
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